Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors
US7821178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2006 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Dec 14, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R39/381
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A direct current electric motor brush and brush housing arrangement which significantly reduces the effect of brush lift in a brushed motor containing viscous fluid. The brush housing enables viscous fluid to avoid momentum transfer into the brushes by providing two or more pressure relief channels that provide the fluid with direct radial exits along the direction of the brush, potentially reducing the brush lift due to the fluid being forced between a rotating commutator and its associated brushes. The pressure relief channels may be located in the housing immediately adjacent to the brush, being radially disposed to the leading face (or leading and trailing faces) of each brush, or in the leading face (or leading and trailing faces) of each brush itself, and may include additional channels in the housing near but not immediately adjacent the brushes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.